from flask import Flask, g, render_template, app
from flask_sqlalchemy import SQLAlchemy
from flask_wtf.csrf import CSRFProtect,generate_csrf
from flask_session import Session
from config import *
import logging
from logging.handlers import RotatingFileHandler
from info.utitils.common import do_index_class,get_user_data



db = SQLAlchemy()
redis_store =  None # type:StrictRedis

def write_log(config_class):
    # 设置日志的记录等级
    logging.basicConfig(level=config_class.LOG_LEVEL)  # 调试debug级
    # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
    file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024 * 1024 * 100, backupCount=10)
    # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
    formatter = logging.Formatter('%(levelname)s %(filename)s:%(lineno)d %(message)s')
    # 为刚创建的日志记录器设置日志记录格式
    file_log_handler.setFormatter(formatter)
    # 为全局的日志工具对象（flask app使用的）添加日志记录器
    logging.getLogger().addHandler(file_log_handler)

def create_app(config_name):

    app = Flask(__name__)

    config_class = config_dict[config_name]
    from info.modules.index import index_bp
    app.config.from_object(config_class)

    write_log(config_class)
    # db = SQLAlchemy(app)
    db.init_app(app)
    global redis_store
    redis_store = redis.StrictRedis(host=Config.REDIS_HOST,
                                    port=Config.REDIS_PORT,
                                    decode_responses = True
                                    )

    CSRFProtect(app)
    @app.after_request
    def set_csrf_token(response):
        csrf_token = generate_csrf()
        response.set_cookie("csrf_token",csrf_token)
        return response

    @app.errorhandler(404)
    @get_user_data
    def handler_404_notfound(err):
        # 1.查询用户基本信息
        user = g.user

        data = {"user_info": user.to_dict() if user else None, }

        # 2.返回404模板数据，同时传入用户信息
        return render_template("news/404.html", data=data)

    # 增加自定义过滤器
    app.add_template_filter(do_index_class,"do_index_class")
    Session(app)
    from info.modules.index import index_bp
    app.register_blueprint(index_bp)

    from info.modules.passport import passport_bp
    app.register_blueprint(passport_bp)

    # 新闻模块的蓝图
    from info.modules.news import news_bp
    app.register_blueprint(news_bp)

    # 个人中心模块的蓝图
    from info.modules.profile import profile_bp
    app.register_blueprint(profile_bp)

    return app



